Indole-3-pyruvic acid oxime ethers and thieno analogues by Heck cyclisation. Application to the synthesis of thia-tryptophans
作者:David Wensbo、Salo Gronowitz
DOI:10.1016/0040-4020(96)00909-x
日期:1996.11
thienoamines (16,18,20) employing methyl or benzyl oxime ethers of ethyl (E)-2-oxo-5-bromo-3-pentenoate 2a, followed by palladium-catalysed Heck cyclisation yielded oxime ethers of Bz-substituted ethyl indole-3-pyruvates (15a-f) and thienopyrroles (17,19,21–23). Attempted conversion of 2a into the corresponding tosyl hydrazone or oxime resulted in formation of pyridazine (10) and oxazine (13) derivatives.
Indole-3-Acetic Acids and Hetero Analogues by One Pot Synthesis including Heck Cyclisation
作者:David Wensbo、Ulf Annby、Salo Gronowitz
DOI:10.1016/0040-4020(95)00601-4
日期:1995.9
Bz-substituted indole-3-aceticacid ethyl esters (14e-g) and heteroanalogues, i.e. thienopyrroles (14a, c) and selenolopyrrole (14d), were prepared starting from N-BOC protected o-iodo aryl amines. Allylation with ethyl 4-bromocrolonate, followed by palladium-catalysed ring closure in a onepot reaction, yielded N-BOC protected indoles (13e-g), thienopyrroles (13a-c), and selenolopyrrole (13d). The